Drill



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190.592.904. Patented Nov. 2,1897.

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WITNESSES NI/.ENTOR Atlomey IINTTED STATES PATENT Turcs.

CHARLES DAVIS CU'ITS, OF FORT FAIRFIELD, MAINE.

DRILL.

SPECIFICATION forming part of Letters Patent No. 592,904, dated November2, 1897. Application led February 20, 1897. Serial No. 624,350. (Nomodel.)

To all whom it may con-cern:-

Be it known that I, CHARLES DAvrs Corrs, a citizen of the United States,residing at Fort Fairield, in the county of Aroostook and Stateof Maine,have invented certain new and useful Improvements in Drills; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled 4in the art towhich it appertains to make and use the same.

My invention relates to improvements in drill-chucks, and has for itsobject to provide an ordinary hand-drill with a chuck designed to steadythe same when it is applied to a pipe or similar article.

To the accomplishment of this object my invention consists in providingan externallyscrew-threaded sleeve with means for securing it to abit-stock and with a chain-nut dezo signed to travel thereon and tocarry a chainv encircling the object upon which it is desired to operatefor the purpose of properly centering the drill and for insuring theaccuracy of its operation.

Referring to the drawings, Figurel is a side elevation of an ordinarybrace provided with a bit and with `my improved chuck as applied to apipe, parts being in section. Fig. 2 is a top plan view of the chuckremoved from thebrace.. Fig. Sis a similar view of the travelingchain-nut detached.

Referring to the drawings, 1 indicates the brace, 2 the brace-cap, 3 thehandle, Ll the head, 5 the bit-stock, and 6 the bits, of an ordinaryhand-drill.

In the form of drill illustrated the brace is designed to be swiveledupon the bit-stock and designed`tb`eintermittently connected Vthereto bypawl-and-ratchet mechanism 7 of well-known construction.

S indicates what I will termthe cylindrical sleeve of my device, whichis externally screw-threaded and is provided near its upper end with anumber of preferably diametrically opposite threaded taps 9, designed pfor the reception of the threaded portions 10 of chuck-sleeve-securingthumb -screws 1l. The screws `11 are preferably provided with. heads 12,and have their extremities rounded, as at 12', and preferably polished,to prevent their cutting the neck of a bit-stock, against which they aredesigned to be screwed for the purpose of securing the chuck to anordinary stock. Suitable locking-nuts 13 may be provided to insure thefixed adjustment of the screws.

14 indicates the traveling chain-nut, consisting, preferably, of asubstantially circular body part 15, having a screw-threaded bore 16,and provided with diametrically opposite chain-grips 17 of any suitablecharacter. The

,chain-grip illustrated is, however, a preferable embodiment of thatelement of my invention, consisting simply of a swivel 18, to which achain is designed to be attached at one end, and a T-shaped slot 2O uponthe opposite side of the nut designed to receive the free end of thechain and in which the chain may be locked at any desired length byturn-l ing it at right angles to its normal direction.

It will be seen that when the drill is desired to be employed for thepurpose of tapping a metallic pipe or similar article it is simplynecessary to slide the sleeve 8 over the bitstock and secure it thereonby adjusting the thumb-screws 11 to bring their rounded ends 12 rmlyagainst the neck of the stock, the adjustment of the screws being fixedby turning the locking-nuts 13 against the sleeve. The chain-nut is nowrotated upon the sleeve until it assumes the proper relative position,and the bit having been directed against the pipe the chuck-chain iscarried under said pipe and after being drawn tight is secured in thechain-grip 20. All strain upon the chuck-sleeve will be 'opposed by thefrictional contact between the thu mb-screws 11 and the neck of thestock, as well as by a positive limiting-stop formed by the ledge 22 ofthe bitstock, against which the abutment-screws'll are designed toimpinge. gresses in the course of the process of drilling the slackcaused thereby in the chain 19 may be taken up by rotating the travelingnut 14, a very slight rotation being'necessary under ordinarycircumstances to take up the slack produced during the drilling of a tapof reasonable depth.

I do not desire to of construction herein shown and described, butreserve the right to change, modify, or vary them at will within thescope of my invention.

As the bit prolimit myself to the details ICO l. In a drill of thecharacter described, the combination with an externally-screW-threadedsleeve,of adj ustable sleeve-retaining mechanism, designed to retain thesleeve upon a bitstock,a traveling nut carried by the sleeve, and achain adjustably carried by the traveling nut, substantially asspecified.

2. In a drill ofthe character described, the combination with anexternally-screW-threaded sleeve,of ab utment-screws carried thereby,designed to secure the sleeve upon abit-stock, locking-nuts upon saidscrews, a traveling chain-nut carried by the sleeve, a chain secured to011e side of the traveling nut, and a chain-clamp upon the opposite sideof said nut designed to adjustably secure the chain, substantially asspecified.

3. In a drill of the character described, the combination with acylindrical sleeve externally screw-threaded and provided with aplurality of threaded holes near of threaded abutment-screws piercingsaid holes and provided with rounded ends, locknut-s upon saidabutment-screws, a traveling chain-nut provided with aninternally-threaded bore designed to receive the sleeve, and withoppositely-extending chain-clamps, a chain secured to one of saidclamps, and a T-shaped slot the other of said clamps being provided Withand designed to adj ustably retain the free end of the chain,substantially as specified.

In testimony whereof I have signed this specification in the presence oftwo subscribing Witnesses.

CHARLES DAVIS CUT"S.

Vitnesses C. L. RICHARDS, D. J. BELL.

one extremity, l

